It's that the solo playlist is just window dressing. A cloy. Mostly meaningless. Because the best gear is still beyond reach for 99.9% of those who like play solo.
Again, just a backhanded slap at those of us who prefer to play alone.
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The best gear drops often once you hit 500, so you can grind totally solo if that's your thing. Read the twab, tier 5 items start dropping once you hit 500.